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| Laminar (flow) |
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A condition where the fluid particles move in continuous parallel paths.
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| Laminate |
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A product made by bonding together two or more layers (laminations) of material or materials.
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| Lamp |
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Electric powered cap lamp worn for visibility. Also a flame safety lamp used in coal mines to detect mine gases or lack of oxygen.
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| Launder |
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Chute or trough for conveying pulp, water or powdered ore in a mill.
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| Layback |
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Amount of waste rock to be mined in order to achieve a safe working angle of an open pit wall.
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| Leachable |
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Extractable by chemical solvents.
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| Leaching |
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Chemical process to dissolve and extract minerals from ore. Also a natural process by which ground waters dissolve minerals.
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| Leg wires |
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Wires attached to a electric blasting cap. Used to initiate detonation.
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| Lens |
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Body of ore that is thick in the middle and tapers near the ends.
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| Level |
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Perfectly horizontal.
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| Leverage |
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A gain in output force over input force by sacrificing the distance moved. Mechanical advantage or force multiplication.
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| Lift |
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The height a body or column of fluid is raised; for instance, from the reservoir to the pump inlet. Lift is sometimes used to express a negative pressure or vacuum. The opposite of head.
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| Limit switch |
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Electrical device that transmits an electrical signal when in physical contact with an object.
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| Line |
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A tube, pipe or hose which acts as a conductor of hydraulic fluid.
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| Linear actuator |
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A device for converting hydraulic energy into linear motion - a cylinder or ram.
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| Liter (l) |
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Basic unit of volume in the metric system equal to 1,000 cubic centimetres (1.056 US quarts).
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| Load |
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To pack explosives in a drill hole or to place material into a haulage device.
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| Loader |
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Any of a variety of machines, wheel or track mounted, designed primarily to lift and load a truck, train or other mode of transportation.
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| Loading pocket |
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Transfer point where bulk material is loaded by bin, hopper and chute into a skip.
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| Longwall mining |
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Coal mining method where narrow vertical slices are cut by mechanical means along long faces or walls.
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